Hub-bearing assembly for rotatably mounting a tilling disc

Abstract

A hub-bearing assembly is disclosed, wherein the hub-bearing assembly is used for rotatably mounting a tilling disc about an axis of rotation is disclosed. The hub-bearing assembly comprises an annular hub comprising an axially extending tubular portion defining a cylindrical housing and an outer flange for mounting a disc, a bearing unit mounted in the housing, and an elastic damping body arranged in the housing and radially interposed between the hub and an outer ring of the bearing unit.

What is claimed is: 
     
       1. A hub-bearing assembly for rotatably mounting a tilling disc about an axis of rotation, the hub-bearing assembly comprising:
 an annular hub including:
 an axially extending tubular portion defining a generally cylindrical housing, and 
 a radially outer flange for mounting a disc; 
 
 a bearing unit mounted within the housing and comprising an outer ring, a pair of inner rings and a dual set of rolling elements, interposed between the outer ring and the inner rings; and 
 an elastic damping body arranged in the housing and radially interposed between the hub and the outer ring of the bearing unit, wherein the elastic damping body extends axially outwardly past a first axial end and a second axial end of the outer ring, wherein one axial end of the elastic damping body is free of abutment, 
 the housing is delimited radially by a substantially cylindrical inner wall, and wherein the outer ring provides a radially outer surface, 
 the elastic damping body further comprising a tubular sleeve of elastomeric material, radially interposed between the substantially cylindrical wall of the housing and the radially outer surface of the outer ring, 
 the elastic damping body is provided with a tubular wall having a radial thickness which, in an undeformed condition, is greater than a radial distance separating the radially outer surface of the outer ring from the substantially cylindrical wall of the housing, whereby the elastic damping body is radially compressed between the housing and the outer ring, wherein 
 the radially outer flange extends from a first axial end of the tubular portion of the hub; 
 a radially inner flange extends from a second axial end of the tubular portion; and 
 an annular groove formed in the housing, wherein the annular groove extends into the radially inner flange and receives an edge of the elastic damping body, 
 wherein the radially inner flange extends over a radial side of a sealing device. 
 
     
     
       2. A hub-bearing assembly according to  claim 1 , wherein the tubular wall has a substantially constant radial thickness. 
     
     
       3. A hub-bearing assembly according to  claim 1 , wherein one of the inner rings extends axially outwardly past the first axial end of the outer ring. 
     
     
       4. A hub-bearing assembly for rotatably mounting a tilling disc about an axis of rotation, the hub-bearing assembly comprising:
 an annular hub including:
 an axially extending tubular portion defining a generally cylindrical housing, and 
 a radially outer flange for mounting a disc; 
 
 a bearing unit mounted within the housing and comprising an outer ring, a pair of inner rings and a dual set of rolling elements, interposed between the outer ring and the inner rings; and 
 an elastic damping body arranged in the housing and radially interposed between the hub and the outer ring of the bearing unit, 
 wherein the housing is delimited radially by a substantially cylindrical inner wall, and wherein the outer ring provides a radially outer surface, 
 the elastic damping body comprising a tubular sleeve of elastomeric material radially interposed between the substantially cylindrical wall of the housing and the radially outer surface of the outer ring, the elastic damping body is provided with a tubular wall having a radial thickness which, in an undeformed condition, is greater than a radial distance separating the radially outer surface of the outer ring from the substantially cylindrical wall of the housing, whereby the elastic damping body is radially compressed between the housing and the outer ring, 
 and wherein the radially outer flange extends from a first axial end of the tubular portion of the hub, a radially inner flange extends from a second axial end of the tubular portion, and an annular groove formed in the housing, wherein the annular groove extends into the radially inner flange and receives an edge of the elastic damping body. 
 
     
     
       5. A hub-bearing assembly according to  claim 4 , wherein the tubular wall has a substantially constant radial thickness. 
     
     
       6. A hub-bearing assembly according to  claim 4 , wherein an axial length of the elastic damping body is greater than an axial length of the outer ring. 
     
     
       7. A hub-bearing assembly according to  claim 4 , the substantially cylindrical inner wall further comprising a protrusion projecting in a radially inner direction. 
     
     
       8. A hub-bearing assembly according to  claim 7 , wherein the protrusion is in a shape of an annular ridge which extends circumferentially around the substantially cylindrical inner wall. 
     
     
       9. A hub-bearing assembly according to  claim 7 , wherein the protrusion is located at an axially intermediate position between two radial planes, and
 wherein each of the two radial plane is defined by a respective set of the two sets of rolling elements. 
 
     
     
       10. A hub-bearing assembly according to  claim 7 , the radially outer surface of the outer ring further comprising at least one radial recess extending in a radially inner direction. 
     
     
       11. A hub-bearing assembly according to  claim 10 , wherein the radial recess is shaped as one of an annular channel or groove, and
 wherein the radial recess extends circumferentially around the radially outer surface of the outer ring.